insipidness vs blandness

insipidness and blandness both are nouns.

Word	Noun	Adjective	Verb	Adverb
insipidness	Yes	No	No	No
blandness	Yes	No	No	No

As nouns, insipidness and blandness are synonyms defined as:

insipidness and blandness: lacking any distinctive or interesting taste property

Other synonyms of insipidness include insipidity.

insipidness (noun)	blandness (noun)
lacking any distinctive or interesting taste property	lacking any distinctive or interesting taste property
extreme dullness; lacking spirit or interest	the quality of being bland and gracious or ingratiating in manner
	the trait of exhibiting no personal embarrassment or concern